JP2006224710A - Looseness preventing structure for rotating member, and webbing winding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a looseness preventing structure for a rotating member, which can restrict the generation of looseness of the rotating member in the axial direction without increasing the number of parts items, and to provide a webbing winding device having this looseness preventing structure. <P>SOLUTION: In the webbing winding device, one axial end part (a bearing part 116) of a lock plate 46 is rotatably supported by a support shaft 41 for a spring cover 40. On the other hand, plate springs 128 are continuously formed in the spring cover 40, and a tip part 128B of the plate spring 128 is brought in pressure-contact with the axial end part of the lock plate 46. With this structure, the lock plate 46 is energized toward the other end side in the axial direction. Since the lock plate 46 is pushed to a gear case, which supports the other axial end part (a lock part 48) of the lock plate 46, the generation of looseness of the lock plate 46 in the axial direction is restricted. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention provides a rattling structure for a rotating member that is rotatably supported by a rotating shaft of a shaft supporting member, and a winding that winds an occupant-constrained webbing belt in layers when predetermined conditions such as vehicle rapid deceleration are satisfied. The present invention relates to a webbing take-up device including a lock mechanism that prevents rotation of a take-up shaft in the webbing pull-out direction.

  Some webbing take-up devices attached to a vehicle include a lock mechanism that prevents rotation of the take-up shaft of the take-up shaft that winds the webbing belt in layers in the event of an emergency of the vehicle, an example of which is It is disclosed in the following Patent Document 1. The lock mechanism has, for example, a lock gear that rotates coaxially with the winding shaft, and ratchet teeth are formed on the outer peripheral surface thereof. Furthermore, the lock mechanism also has a lock plate corresponding to the lock gear. The lock plate is pivotally supported by a rotation shaft of a shaft support member attached to a frame for supporting the take-up shaft, and the lock plate rotates around the shaft so that the lock gear ratchet is rotated. The teeth can be engaged. In addition, there is a lock mechanism in which a lock plate can be directly engaged with a winding shaft without providing a lock gear.

  The webbing retractor provided with such a lock mechanism includes an acceleration sensor that detects a sudden deceleration state of the vehicle. The acceleration sensor detects the acceleration (deceleration) of the vehicle and activates the lock mechanism when the acceleration (deceleration) of the vehicle is greater than or equal to a certain value. When the acceleration sensor detects that the acceleration (deceleration) of the vehicle is above a certain level, the lock mechanism is activated and the lock plate is engaged directly or indirectly (via the lock gear) with the take-up shaft, The lock plate receives the rotational force (load) in the webbing pull-out direction of the winding shaft and prevents the winding shaft from rotating in the webbing pull-out direction.

  By the way, since the lock plate is simply pivotally supported by the pivot support member, the lock plate rattles in its own axial direction. For this reason, it can be considered that an urging member such as a spring washer is provided between the lock plate and the shaft support member to prevent backlash.

However, when an urging member such as a spring washer is provided between the lock plate and the shaft support member, there is a problem that the number of parts and assembly man-hours of the apparatus increase. For this reason, there has been a demand for a measure for suppressing rattling of the lock plate without providing an urging member such as a spring washer between the lock plate and the shaft support member.
Japanese National Patent Publication No. 10-500168

  In view of the above problems, an object of the present invention is to obtain a rotating member backstop structure capable of suppressing the backlash of the rotating member in the axial direction without increasing the number of parts, and a webbing take-up device having the backlash stopping structure. And

  According to the first aspect of the present invention, there is provided a backlash preventing structure for a rotating member that restricts axial displacement of the rotating member that is rotatably supported at one end in the axial direction by the shaft supporting member. The distal end side is in pressure contact with one axial end portion of the rotating member, and an urging portion that urges the rotating member toward the other axial end side is continuously formed from the axial support member.

  According to the ratchet structure of the rotating member according to the first aspect of the present invention, the rotating member is pivotally supported by the shaft supporting member at one end in the axial direction.

  On the other hand, an urging portion is formed continuously from the shaft support member, and this urging portion is in pressure contact with one axial end portion of the rotating member. For this reason, the rotating member is biased toward the other end in the axial direction. As a result, for example, the rotating member is pressed against a frame or a plate that supports the other axial end of the rotating member, so that the play of the rotating member in the axial direction is suppressed.

  Therefore, the backlash prevention structure of the rotating member according to claim 1 suppresses the backlash of the rotating member in the axial direction without providing an urging member such as a spring washer between the rotating member and the shaft support member. it can.

  In addition, since it is not necessary to provide a biasing member such as a spring washer between the rotating member and the shaft support member in this way, it is possible to reduce the number of parts of the apparatus and the number of assembling steps.

  According to a second aspect of the present invention, there is provided the ratchet structure for the rotating member according to the first aspect, wherein the front end side of the urging portion is located in the vicinity of the axial position of the rotating member. .

  According to the backlash preventing structure of the rotating member according to the second aspect of the present invention, since the distal end side of the urging portion is located in the vicinity of the axial position of the rotating member, the rotating member is independent of whether or not it has rotated. (When the rotating member rotates, regardless of the amount of rotation), it is always pressed against the urging portion. For this reason, the rotating member is always urged toward the other end in the axial direction. Thereby, the rotating member is always pressed against, for example, a frame or a plate that supports the other axial end of the rotating member. Therefore, the ratchet structure for the rotating member according to claim 2 can effectively absorb the axial play of the rotating member.

  According to a third aspect of the present invention, there is provided a webbing take-up device that is rotatably supported at one end in the axial direction by a take-up shaft that takes up a webbing belt for restraining an occupant and a shaft support member, and that rotates and is predetermined. Locking means configured to include a lock plate that prevents rotation of the winding shaft in the webbing pull-out direction by directly or indirectly engaging the winding shaft under the conditions of And an urging portion that presses against the one end portion in the axial direction of the lock plate and urges the lock plate toward the other end side in the axial direction.

  In the webbing take-up device according to the third aspect of the invention, when the occupant wears the webbing belt, the webbing belt is pulled out from the take-up shaft and attached to the occupant. Thereby, a passenger | crew's body is restrained.

  Further, in this webbing take-up device, one end of the lock plate in the axial direction of the lock plate is rotatably supported by a shaft support member, and the lock plate rotates under a predetermined condition (for example, when the vehicle is suddenly decelerated). And directly or indirectly engaged with the winding shaft. Accordingly, since the rotation of the winding shaft in the webbing pull-out direction is prevented, the webbing belt is not pulled out from the winding shaft, and the occupant's body can be restrained by the webbing belt even under predetermined conditions.

  By the way, in this webbing take-up device, the urging portion is continuously formed from the shaft support member, and the distal end side of the urging portion is in pressure contact with one axial end portion of the lock plate. For this reason, the lock plate is biased toward the other end in the axial direction. As a result, for example, the lock plate is pressed against a frame or plate that supports the other axial end of the lock plate, so that the play of the rotating member in the axial direction is suppressed.

  Therefore, the webbing retractor according to the third aspect of the present invention can suppress the backlash in the axial direction of the lock plate without providing an urging member such as a spring washer between the lock plate and the shaft support member.

  Further, it is not necessary to provide an urging member such as a spring washer between the lock plate and the shaft support member in this way, so that the number of parts and assembly man-hours of the apparatus can be reduced.

  According to a fourth aspect of the present invention, there is provided the webbing take-up device according to the third aspect of the invention, wherein the front end side of the urging portion is located in the vicinity of the axial position of the lock plate.

  In the webbing take-up device according to the fourth aspect of the present invention, since the distal end side of the urging portion is located in the vicinity of the axial position of the lock plate, the lock plate does not depend on whether it has rotated (the lock plate Is always pressed against the urging portion (regardless of the amount of rotation). For this reason, the lock plate is always urged toward the other end in the axial direction. Thereby, the lock plate is always pressed against, for example, a frame or a plate that supports the other axial end of the lock plate. Therefore, the webbing take-up device according to claim 4 can effectively absorb the backlash in the axial direction of the lock plate.

  As described above, the rotating member ratchet structure according to the present invention and the webbing take-up device having the ratchet stopping structure described above have the axial direction of the rotating member (in the webbing take-up device, the lock plate) without increasing the number of parts. It has an excellent effect that it can suppress the rattling.

  FIG. 2 shows an exploded perspective view of the main part of the webbing take-up device 10 according to the embodiment of the present invention as seen from one side obliquely upward.

  The webbing take-up device 10 according to the present embodiment includes a metal frame 12 having a U-shaped plate shape when viewed from above, and the frame 12 is fixed in the vehicle interior. On one side wall 12A of the frame 12, a notch 13A for rotatably disposing a lock portion 48 of a lock plate 46 described later is formed. The other side wall 12B of the frame 12 is formed with a notch 13B for rotatably disposing a bearing portion 116 of a lock plate 46 described later. A connecting piece 14 is bridged between the upper end of one side wall 12A of the frame 12 and the upper end of the other side wall 12B. The connecting piece 14 is fixed in the passenger compartment and an insertion hole 16 is formed. .

  A spool 18 as a take-up shaft is rotatably supported between one side wall 12A and the other side wall 12B of the frame 12. A long belt-like webbing belt 20 for restraining an occupant is wound around the spool 18, and the webbing belt 20 has a columnar shaft 22 provided at the base end locked to the spool 18 and the vicinity of the base end. Is inserted into the spool 18 and locked to the spool 18. The webbing belt 20 is inserted through the insertion hole 16 in the vicinity of the portion wound around the spool 18, and the webbing belt 20 is attached to a vehicle occupant. The spool 18 is wound in the winding direction so that the webbing belt 20 is wound, while the spool 18 is rotated in the pulling direction (webbing pulling direction) so that the webbing belt 20 is pulled out.

  A torsion shaft 24 that constitutes locking means is disposed at the central axis portion of the spool 18, and the torsion shaft 24 can be torsionally deformed by applying a torsional load that exceeds a predetermined load. The other end of the torsion shaft 24 is locked to the other end of the spool 18, and the torsion shaft 24 rotates integrally with the spool 18. A screw member 26 is screwed to the other end of the torsion shaft 24.

  On one side of the spool 18 is provided a lock gear 28 that constitutes a lock means together with the torsion shaft 24. The lock gear 28 is locked near one end of the torsion shaft 24, and the lock gear 28 rotates integrally with the torsion shaft 24 and the spool 18 except when the torsion shaft 24 is twisted and deformed. Ratchet teeth 30 are formed on the outer periphery of the lock gear 28. Further, a substantially cylindrical knurled hole 32 is formed on the center side of the lock gear 28, and the knurled hole 32 is opened to one side, and the entire outer periphery of the knurled hole 32 is knurled to obtain a knurled surface. 34 is formed.

  An urging mechanism 36 is provided on the other side of the frame 12. The urging mechanism 36 has a spring seat 38, and the spring seat 38 is attached to the outside of the other side wall 12 </ b> B of the frame 12. The spring seat 38 covers the other side surface of the spool 18 in a state where the screw member 26 protrudes to the other side. The other side of the spring seat 38 is covered with a spring cover 40 as a shaft support member, and the spring cover 40 is attached to the outside of the other side wall 12 </ b> B of the frame 12. The spring cover 40 is made of, for example, a resin material. A substantially cylindrical recess 42 is formed in the spring cover 40, and the recess 42 opens to one side.

  A spiral spring 44 is provided in the recess 42 of the spring cover 40, and the outer end of the spiral spring 44 is fixed to the inner peripheral surface of the recess 42. The inner end of the spiral spring 44 is fixed to the screw member 26, and the spiral spring 44 urges the torsion shaft 24, the spool 18 and the lock gear 28 through the screw member 26 in the winding direction.

  Further, the spring cover 40 has a columnar rotating shaft 41 projecting toward one side at a lower portion thereof. The rotating shaft 41 is formed continuously below the spring cover 40, and the rotating shaft 41 corresponds to a lock plate 46 described later.

  A portion of the spring cover 40 below the rotation shaft 41 is formed in a plate shape in which the axial direction of the rotation shaft 41 is the plate thickness direction. The plate-like portion is formed with an inverted concave cutout 126, thereby forming a plate spring 128 as an urging portion. The leaf spring 128 has a base end portion 128 </ b> A formed continuously with the spring cover 40 at the lower end position of the notch 126 (the lower end position in the vertical direction in FIG. 2). A distal end portion 128B of the leaf spring 128 is formed in the vicinity of the rotation shaft 41 so as to protrude to the lock plate 46 side (one side) described later (positioned in the vicinity of the shaft position of the lock plate 46 described later). Such a leaf spring 128 can be elastically deformed in the axial direction of the lock plate 46 (the axial direction of the rotary shaft 41). As shown in FIG. 3, the leaf spring 128 is always in pressure contact with the lock plate 46 (more specifically, the other side wall of the bearing portion 116 of the lock plate 46 described later). As a result, the leaf spring 128 urges the lock plate 46 to one side in the axial direction (one side in the axial direction of the rotating shaft 41) by its own elastic force.

  The lock plate 46 constitutes locking means together with the torsion shaft 24 and the lock gear 28. The lock plate 46 is arranged so as to span between the one side wall 12A and the other side wall 12B of the frame 12.

  As shown in FIG. 1, the lock plate 46 includes a bearing portion 116 corresponding to the notch 13 </ b> B of the frame 12. The bearing portion 116 is a plate-like body formed in a substantially L shape, and a bearing hole 117 is formed at one end portion along the plate thickness direction. The rotation shaft 41 of the spring cover 40 is inserted into the bearing hole 117 of the bearing portion 116, and the lock plate 46 is rotatably supported by the rotation shaft 41, and the bearing portion 116 rotates inside the notch 13B. It is possible.

  A connecting portion 114 is continuously formed on the other end side (the non-bearing hole 117 side) of the bearing portion 116. The connecting portion 114 is a plate-like body that is elongated in the spanning direction of the lock plate 46. At the other end portion of the connecting portion 114, the bearing portion 116 is erected with the plate thickness direction perpendicular to the plate thickness direction of the connecting portion 114.

  A lock portion 48 is continuously formed at the end of the connecting portion 114 on the side opposite to the bearing 116 (the end on the side wall 12A). The locking portion 48 is substantially T-shaped and extends from one end of the connecting portion 114 to one side in the plate thickness direction of the connecting portion 114 (the side where the bearing portion 116 is erected in the plate thickness direction of the connecting portion 114). A plate-like body.

  Such a lock portion 48 is integrally provided with a shaft portion 124 protruding toward one side. The shaft portion 124 is formed in a columnar shape, and the shaft portion 124 is provided on one end side of the lock portion 48 with its shaft position shifted in parallel to the other end side in the width direction from the shaft position of the support shaft 120.

  The support shaft 120 is provided integrally with the lock portion 48, and the support shaft 120 protrudes from the lock portion 48 toward one side. The support shaft 120 is formed in a columnar shape, and the support shaft 120 is provided on one end side of the lock portion 48 with the shaft position being the same as the shaft position of the bearing hole 117 of the bearing portion 116.

  The support shaft 120 of the lock portion 48 is inserted into a shaft support hole 55 formed in the lower portion of the gear case 52 described below as a plate, and the lock portion 48 is rotatably supported by the gear case 52. 48 is rotatable inside the notch 13A. In this state, the lock portion 48 is disposed obliquely below the lock gear 28 as shown in FIG. A lock tooth 50 is formed at the other end of the lock portion 48 (see FIG. 1), and the lock portion 48 is disposed on the side opposite to the lock gear 28 so that the lock tooth 50 cannot mesh with the ratchet teeth 30 of the lock gear 28. Has been.

  As shown in FIG. 2, the gear case 52 is attached to the outside of one side wall 12 </ b> A of the frame 12, and the gear case 52 covers one side of the lock gear 28. A circular through hole 54 is formed at the center of the gear case 52, and the through hole 54 exposes the knurled hole 32 of the lock gear 28 and the torsion shaft 24 is penetrated.

  A circular shaft support hole 55 having a smaller diameter than the through hole 54 is formed obliquely below the through hole 54. The shaft support hole 55 corresponds to the support shaft 120 of the lock plate 46. The support shaft 120 of the lock plate 46 is inserted into the shaft support hole 55, and the gear case 52 rotatably supports the lock portion 48 of the lock plate 46 as described above, and the lock portion 48 is notched in the frame 12. 13A can be rotated inside. In this manner, the gear case 52 supports the lock plate 46 in a rotatable manner in cooperation with the spring cover 40, and the connecting portion 114 of the lock plate 46 is connected to the one side wall 12A and the other side wall 12B of the frame 12. It spans between them.

  A pretensioner mechanism 56 is provided outside the one side wall 12 </ b> A of the frame 12. The pretensioner mechanism 56 has a pinion 58. The pinion 58 is disposed on one side of the gear case 52 and is rotatably supported by the torsion shaft 24. Pinion teeth 60 are formed on one side of the pinion 58. On the other hand, cams 62 are formed on the other side of the pinion 58, and irregularities are alternately formed on the outer periphery of the cam 62. The cam 62 is inserted into the knurled hole 32 through the through hole 54 of the gear case 52 and is not in contact with the knurled surface 34, so that the lock gear 28 can rotate independently of the pinion 58.

  The pretensioner mechanism 56 has a clutch plate 64, and the clutch plate 64 is disposed between the gear case 52 and the pinion 58. A plurality of meshing claws 66 are formed on the center side of the clutch plate 64, and each meshing claw 66 projects from the clutch plate 64 to the other side. Each meshing claw 66 is fitted in each recess of the cam 62, whereby the clutch plate 64 is attached to the pinion 58. Each engagement claw 66 is inserted into the knurled hole 32 together with the cam 62 through the through hole 54 of the gear case 52 and is not in contact with the knurled surface 34, so that the lock gear 28 can rotate independently of the clutch plate 64. It is said that.

  The pretensioner mechanism 56 has a substantially L-shaped cylindrical cylinder 68, and the cylinder 68 is fixed to the outside of one side wall 12 </ b> A of the frame 12 below the pinion 58. A gas generator 70 is provided at a lower end of the cylinder 68 and a bottomed cylindrical generator cap 72 is fixed. The gas generator 70 is attached to the cylinder 68 with the generator cap 72 covered. The lower end is closed.

  The pretensioner mechanism 56 has a piston 74, and the piston 74 is inserted into the cylinder 68 from the upper end. An O-ring 76 is provided at the lower end of the piston 74, and the O-ring 76 seals between the lower end of the piston 74 and the cylinder 68. Further, a rack 78 is formed at a portion other than the lower end of the piston 74.

  The pretensioner mechanism 56 has a cover plate 80 having a substantially triangular prism container shape, and the cover plate 80 is fixed to the outside of one side wall 12 </ b> A of the frame 12. The cover plate 80 has the torsion shaft 24 inserted in the lower part thereof, and supports the torsion shaft 24 rotatably. The other side surface and the lower surface of the cover plate 80 are opened. The cover plate 80 accommodates the pinion 58, the clutch plate 64, and the upper portion of the piston 74 therein, and between the one side wall 12A of the frame 12, The gear case 52 is pinched.

  One side of the pretensioner mechanism 56 is provided with a sensor mechanism 82 that constitutes the locking means together with the torsion shaft 24, the lock gear 28, and the lock plate 46. The sensor mechanism 82 has a box-shaped sensor holder 84 that is open on the other side, and the sensor holder 84 is fixed to one side wall 12A of the frame 12 with the torsion shaft 24 inserted through the upper part. . One side of the sensor holder 84 is covered with a box-shaped sensor cover 86 opened on the other side, and the sensor cover 86 is fixed to the sensor holder 84 and one side wall 12 </ b> A of the frame 12.

  An acceleration sensor 88 is held below the sensor holder 84, and the acceleration sensor 88 is disposed in a gap between the sensor holder 84 and the sensor cover 86. The acceleration sensor 88 has a placement unit 90. A concave portion having a substantially inverted conical shape is formed on the upper surface of the mounting portion 90, and a sphere 92 is placed in the concave portion of the mounting portion 90. A movable claw 94 is rotatably supported above the sphere 92, and the movable claw 94 is placed on the sphere 92.

  A V gear 96 is provided in the gap between the sensor holder 84 and the sensor cover 86, and the V gear 96 is locked at one end of the torsion shaft 24 and rotates integrally with the torsion shaft 24. To do. Ratchet teeth 98 are formed on the outer periphery of the V gear 96.

  A W pawl 100 is rotatably supported by the V gear 96, and a W mass 102 is fixed to the W pawl 100. A sensor spring 104 is stretched between the V gear 96 and the W pawl 100, and the sensor spring 104 urges the V gear 96 in the winding direction with respect to the W pawl 100.

  A substantially disc-shaped gear sensor 106 is provided on one side of the V gear 96 in the gap between the sensor holder 84 and the sensor cover 86, and the gear sensor 106 rotates on one side edge of the torsion shaft 24. Supported as possible. A coil spring 108 is spanned between the gear sensor 106 and the inner surface of the sensor cover 86, and the coil spring 108 biases the gear sensor 106 in the winding direction.

  An engaging claw 110 is rotatably supported on one side below the gear sensor 106, and the engaging claw 110 has a rotation center axis parallel to the axial direction of the torsion shaft 24 and the V gear 96. The ratchet teeth 98 can be engaged with each other. Further, a pressing piece 112 is formed on the lower side of the gear sensor 106 on the other side.

  Next, the operation of the present embodiment will be described.

  In the webbing take-up device 10 configured as described above, the spiral spring 44 of the biasing mechanism 36 biases the torsion shaft 24, the spool 18 and the lock gear 28 in the winding direction via the screw member 26, whereby the webbing belt. 20 is urged in the direction of being wound around the spool 18.

  In such a webbing take-up device 10, when the occupant wears the webbing belt 20, the webbing belt 20 is pulled out from the spool 18 and attached to the occupant. Thereby, a passenger | crew's body is restrained.

  Further, in the webbing retractor 10, the acceleration sensor 88 of the sensor mechanism 82 detects that the acceleration of the vehicle (the movement acceleration of the spool 18) is equal to or greater than a predetermined acceleration. In other words, when the acceleration of the vehicle is equal to or higher than a predetermined acceleration (for example, when the vehicle is suddenly decelerated), the sphere 92 of the acceleration sensor 88 moves up the concave portion of the mounting portion 90 toward the non-acceleration direction and moves up. Push up. As a result, the movable claw 94 rotates the engagement claw 110 of the gear sensor 106 and meshes with the ratchet teeth 98 of the V gear 96, whereby the gear sensor 106 is connected to the V gear 96.

  The W pawl 100, the W mass 102, and the sensor spring 104 of the sensor mechanism 82 detect that the pulling acceleration of the webbing belt 20 (rotational acceleration in the pulling direction of the spool 18) is equal to or greater than a specific acceleration. That is, when the pulling acceleration of the webbing belt 20 is equal to or higher than a specific acceleration, the W pawl 100 and the W mass 102 are pulled out by inertia with respect to the V gear 96 rotated in the pulling direction via the spool 18 and the torsion shaft 24. By suppressing the rotation in the direction, the W pawl 100 and the W mass 102 are rotated with respect to the V gear 96. As a result, the W pawl 100 rotates the engagement claw 110 of the gear sensor 106 and meshes with the ratchet teeth 98 of the V gear 96, whereby the gear sensor 106 is connected to the V gear 96.

  When the gear sensor 106 is connected to the V gear 96 as described above, the pulling load from the occupant to the webbing belt 20 causes the V gear 96 and the gear sensor 106 to be pulled out via the spool 18 and the torsion shaft 24. Rotate somewhat to. In this case, the rotational force of the V gear 96 and the gear sensor 106 is reduced by the urging force of the sensor spring 104 increased by the inertia of the W pawl 100 and the W mass 102.

  On the other hand, the bearing portion 116 of the lock plate 46 is rotatably supported by the rotation shaft 41 of the spring cover 40. The lock portion 48 of the lock plate 46 is rotatably supported by the gear case 52 with the support shaft 120 integral with the lock portion 48 being inserted into the shaft support hole 55 of the gear case 52. That is, the lock plate 46 is spanned between the one side wall 12A and the other side wall 12B of the frame 12 by the spring cover 40 and the gear case 52, and is rotatably supported by the shaft.

  As described above, the lock plate 46 is rotated toward the spool 18 by the pressing piece 112 of the gear sensor 106 as the gear sensor 106 is slightly rotated in the pull-out direction as described above. That is, the lock part 48 rotates to the lock gear 28 side. Accordingly, a pulling load is applied from the occupant to the webbing belt 20 and a rotational force is applied to the spool 18, the torsion shaft 24 and the lock gear 28 in the pulling direction, whereby the lock teeth 50 of the lock portion 48 are ratchet of the lock gear 28. Engagement with the teeth 30 prevents the lock gear 28 from rotating in the pull-out direction and prevents the webbing belt 20 from being pulled out. For this reason, the webbing belt 20 is not pulled out from the spool 18, and the occupant's body can be restrained by the webbing belt 20 even when the acceleration of the vehicle is equal to or higher than a predetermined acceleration (for example, when the vehicle is suddenly decelerated). reference).

  By the way, in the webbing take-up device 10, the leaf spring 128 is continuously formed from the spring cover 40, and the distal end portion 128 </ b> B of the leaf spring 128 is located in the vicinity of the axial position of the lock plate 46 (near the rotating shaft 41). Therefore, regardless of whether or not the lock plate 46 is rotated (the rotation amount (for example, the position during rotation, the position after rotation, etc.) when the lock plate 46 rotates). Regardless of this, the lock plate 46 is always in pressure contact with one axial end portion (the other side wall of the bearing portion 116). For this reason, the lock plate 46 is always biased toward the other axial end (one side) by the elastic force of the leaf spring 128. As a result, for example, the lock plate 46 is always pressed against the gear case 52 that supports the lock portion 48 of the lock plate 46, so that the backlash in the axial direction of the lock plate 46 is effectively suppressed (absorbed).

  Therefore, in the webbing take-up device 10, the backlash in the axial direction of the lock plate 46 is effectively suppressed without providing an urging member such as a spring washer between the lock plate 46 and the spring cover 40 ( (See FIG. 1 and FIG. 3).

  In addition, since it is not necessary to provide an urging member such as a spring washer between the lock plate 46 and the spring cover 40 in this way, the number of parts and assembly man-hours of the apparatus can be reduced.

  In the present embodiment, the distal end portion 128B of the leaf spring 128 is in pressure contact with the bearing portion 116 of the lock plate 46, but the present invention is not limited to this. It suffices if the distal end portion 128B side (that is, the distal end side) of the leaf spring 128 is in pressure contact with the bearing portion 116 of the lock plate 46 from the proximal end portion 128A.

  In the present embodiment, the lock plate 46 is pressed against the gear case 52 as a plate by the elastic force of the leaf spring 128, but the present invention is not limited to this. For example, in the case of the webbing take-up device 10 configured such that the notch 13A of the one side wall 12A is not formed in the frame 12 and the lock portion 48 rotates between the one side wall 12A and the other side wall 12B, the lock plate 46 may be pressed against the one side wall 12A of the frame 12 by the elastic force of the leaf spring 128.

  In the webbing retractor 10 of the present embodiment, the lock portion 48 of the lock plate 46 is engaged (indirectly engaged) with the spool 18 via the lock gear 28 and the torsion shaft 24. The invention is not limited to this. The webbing take-up device 10 may be configured such that the lock portion 48 is directly engaged with a spool integrally having a lock gear.

It is a disassembled perspective view of the vicinity of the connecting portion between the lock plate and the shaft support member in the webbing take-up device according to the embodiment of the present invention. It is the disassembled perspective view seen from diagonally upward one side which shows the webbing winding device concerning an embodiment of the invention. It is sectional drawing corresponding to FIG. 1 in the connection part vicinity of a lock plate and a shaft support member.

Explanation of symbols

10 Webbing take-up device 12 Frame 18 Spool (winding shaft)
20 Webbing belt 24 Torsion shaft (locking means)
40 Spring cover (shaft support member)
41 Rotating shaft 46 Lock plate (locking means)
52 Gear case (shaft support member)
70 Lock gear (locking means)
76 Ratchet teeth 82 Sensor mechanism (locking means)
128 leaf spring (biasing section)
128B tip (tip side of biasing part)

Claims (4)

A rotating member backlash preventing structure that restricts axial displacement of a rotating member that is rotatably supported at one end in the axial direction by a shaft supporting member,
The tip side is in pressure contact with one axial end portion of the rotating member, and a biasing portion that biases the rotating member toward the other axial end side is continuously formed from the shaft supporting member.
A rotating member backlash structure characterized by that. The front end side of the urging portion is located in the vicinity of the axial position of the rotating member.
The rattling structure for a rotating member according to claim 1. A take-up shaft for winding up a webbing belt for restraining an occupant;
One end side in the axial direction is pivotally supported by the pivotal support member, and rotates to engage the winding shaft directly or indirectly under predetermined conditions to rotate the winding shaft in the webbing pull-out direction. A locking means comprising a locking plate for blocking;
An urging portion that is formed continuously from the shaft support member, the tip side presses against one axial end of the lock plate, and urges the lock plate toward the other axial end;
A webbing take-up device comprising: The tip side of the urging portion is located in the vicinity of the axial position of the lock plate.
The webbing take-up device according to claim 3.

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